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NEET • BIOLOGY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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151 Hard

151 of 331

Understanding +4 | -1

Assertion (A): Adenine and Guanine are substituted purines.

Reason (R): In Adenine and Guanine purine heterocyclic ring has either amino or amino and oxy groups.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A is correct because both the assertion and reason are true, and the reason correctly explains why Adenine and Guanine are substituted purines.

152 Hard

152 of 331

Remembering +4 | -1

The charged molecule which is electrically neutral is known as

View answer and explanation

Correct option: B

Zwitterion

Option B (Zwitterion) is correct because a zwitterion is a molecule that contains both positive and negative electrical charges, resulting in an overall neutral charge.

153 Hard

153 of 331

Analyzing +4 | -1

The figure shows a hypothetical tetrapeptide portion of a
protein with parts labelled A-D. Which one of the following
option is correct?

View answer and explanation

Correct option: B

D is the acidic amino acid - glutamic acid

Option B (D is the acidic amino acid - glutamic acid) is correct because the structure of D, with a carboxylic acid group in the side chain, indicates it is an acidic amino acid, specifically glutamic acid.

154 Medium

154 of 331

Understanding +4 | -1

Hydrolysis of a glycosidic bond in a disaccharide is an example of

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Correct option: C

Transformation of biomolecules

Option B (Hydrolysis of biomolecules) is correct because breaking a glycosidic bond by adding water is a hydrolysis reaction.

155 Medium

155 of 331

Understanding +4 | -1

Read the following statements and choose the correct option Statement A : Aspartic acid is the only know acidic amino acid Statement B : Methionine is an essential amino acid

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Correct option: C

Only statement B is correct

The correct answer is C because aspartic acid is an acidic amino acid, but it's not the *only* one (glutamic acid is another). Methionine *is* an essential amino acid.

156 Medium

156 of 331

Remembering +4 | -1

In plants inulin and pectin are

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Correct option: A

reserved food material

Option A (reserved food material) is correct because inulin and pectin are storage polysaccharides in plants.

157 Medium

157 of 331

Remembering +4 | -1

Jojoba contains

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Correct option: B

Wax

Option B (Wax) is correct because Jojoba oil is primarily composed of wax esters, not triglycerides, sterols, or a mixture of wax and triglycerides.

158 Medium

158 of 331

Analyzing +4 | -1

Find out the odd one from the given pair.

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Correct option: D

Polynucleotide – Hydrogen bond

Option C (0.32) is correct because in dsDNA, A=T and G=C. If C is 18%, G is also 18%. Therefore, A+T = 100 - (18+18) = 64%, so A = 32%.

159 Hard

159 of 331

Remembering +4 | -1

When the temperature is increased by

10^\circ C

the rate of a reaction increases?

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Correct option: A

2 times

Option A (2 times) is correct because, as a general rule of thumb, the rate of a reaction approximately doubles for every 10°C increase in temperature.

160 Hard

160 of 331

Understanding +4 | -1

Malonate inhibits succinate dehydrogenase, is an example of

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Correct option: C

Competitive inhibition

Option C (Competitive inhibition) is correct because malonate resembles succinate and competes for the active site of succinate dehydrogenase.

161 Medium

161 of 331

Remembering +4 | -1

Maltose consists of which one of the following?

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Correct option: D

Glucose and glucose

Option D (Glucose and glucose) is correct because maltose is a disaccharide formed by two glucose molecules linked by an α-1,4-glycosidic bond.

162 Medium

162 of 331

Understanding +4 | -1

Which of the following statements about enzymes are correct?
I. Enzymes do not alter the overall change in free energy for a reaction
II. Enzymes are highly specific for reactions
III. The energy input needed to start a chemical reaction is called activation energy
IV. Enzymes are proteins whose three dimensional shape is key to their functions

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Correct option: D

All of these

Option D (All of these) is correct because all the statements about enzymes are accurate and fundamental to their function.

163 Easy

163 of 331

Understanding +4 | -1

Lipids are generally
I. water soluble
II. water insoluble
III. soluble in non-polar organic solvents
IV. not soluble in non-polar organic solvents
Choose the correct options

View answer and explanation

Correct option: B

II and III

Option B (II and III) is correct because lipids are hydrophobic (water insoluble) and dissolve in non-polar organic solvents.

164 Easy

164 of 331

Remembering +4 | -1

An amino acid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called

View answer and explanation

Correct option: D

Zwitterionic form

Option D (Zwitterionic form) is correct because a zwitterion is a molecule with both positive and negative electrical charges, resulting in a net neutral charge.

165 Easy

165 of 331

Understanding +4 | -1

Choose a correct statement w.r.t. glycerol.

View answer and explanation

Correct option: C

It is a simple lipid called trihydroxypropane

Option C (It is a simple lipid called trihydroxypropane) is correct because glycerol is a three-carbon alcohol with three hydroxyl groups, which is chemically trihydroxypropane.

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166 Hard

166 of 331

Analyzing +4 | -1

Which of the following is not correctly matched with its category?

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Correct option: A

Insulin - Carbohydrate

Option A (Insulin - Carbohydrate) is not correctly matched because insulin is a protein hormone, not a carbohydrate.

167 Hard

167 of 331

Understanding +4 | -1

Given below are two statements:

Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal).

Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of

\alpha

type and two subunits of

\beta

type.)

In the light of the above statements, choose the correct answer from the options given below:

View answer and explanation

Correct option: B

Statement I is false but Statement II is true

Option B is correct because Statement I is false (protein's left end is N-terminal and right end is C-terminal), and Statement II is true (adult hemoglobin has two alpha and two beta subunits).

168 Easy

168 of 331

Understanding +4 | -1

Cholesterol is considered as a crucial molecule in animals because it is

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Correct option: D

Source of many vertebrate hormones and other steroids

Option D (Source of many vertebrate hormones and other steroids) is correct because cholesterol is a precursor for steroid hormones and other essential steroids in vertebrates.

169 Medium

169 of 331

Analyzing +4 | -1

(A) A + G / T + C ratio can be used to identify the sps.
(R) Purine and pyrimidine ratio changes with age (or) tissue

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Correct option: D

Both A and R are false

Option D is correct because the A+G/T+C ratio is always 1 in double-stranded DNA due to Chargaff's rules, and this ratio does not change with age or tissue.

170 Hard

170 of 331

Remembering +4 | -1

Glutamic acid is represented by the single letter code ______

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Correct option: D

Option D (E) is correct because the single-letter code for glutamic acid is E.

171 Easy

171 of 331

Understanding +4 | -1

What is the starting point in the production of food?

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Correct option: D

Photosynthesis

Option D (Photosynthesis) is correct because photosynthesis is the process by which plants and other organisms convert light energy into chemical energy in the form of glucose, which serves as the starting point for food production.

172 Medium

172 of 331

Understanding +4 | -1

The substances which are not true bio-macromolecules but present as a structural component in all biological membranes are

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Correct option: C

Lipids

Option C (Lipids) is correct because lipids are structural components of all biological membranes, even though they aren't true macromolecules.

173 Medium

173 of 331

Remembering +4 | -1

The left handed DNA is called

View answer and explanation

Correct option: C

Z-DNA

Option C (Z-DNA) is correct because Z-DNA is a left-handed double helix, unlike the more common right-handed B-DNA.

174 Medium

174 of 331

Analyzing +4 | -1

Assertion: In a DNA molecule, A–T rich parts melt before G–C rich parts.
Reason: In between A and T there are three H–bond, whereas in between G and C there are two H–bonds.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C is correct because while the assertion is true (A-T rich parts melt before G-C rich parts), the reason is false (A-T has two H-bonds, G-C has three).

175 Hard

175 of 331

Remembering +4 | -1

The type of bond involved in the formation of sodium chloride, is

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Correct option: C

Ionic bond

Option C (Ionic bond) is correct because sodium chloride (NaCl) is formed through the transfer of an electron from sodium to chlorine, resulting in an ionic bond.

176 Medium

176 of 331

Understanding +4 | -1

Which one of the following biomolecules is correctly characterized?

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Correct option: A

Lecithin – A phosphorylated glyceride found in cell membrane

Option A (Lecithin – A phosphorylated glyceride found in cell membrane) is correctly characterized because lecithin is indeed a phospholipid present in cell membranes.

177 Easy

177 of 331

Understanding +4 | -1

Pick out the wrong statement

View answer and explanation

Correct option: C

Lysine is a neutral amino acid

Option C (Lysine is a neutral amino acid) is the wrong statement because Lysine is a basic amino acid due to the presence of an additional amino group.

178 Medium

178 of 331

Remembering +4 | -1

Variety of amino acids are formed on the basis of

View answer and explanation

Correct option: D

Nature of R group

Option D (Nature of R group) is correct because the variety of amino acids is determined by the different chemical structures of their R-groups (side chains).

179 Medium

179 of 331

Analyzing +4 | -1

Assertion : Comparative biochemistry provides
a strong evidence in favour of common ancestory
of living beings.

Reason : Genetic code is universal.

View answer and explanation

Correct option: B

If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion

Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because comparative biochemistry does provide evidence for common ancestry, and the genetic code is universal, but the universality of the genetic code doesn't directly explain why comparative biochemistry provides evidence for common ancestry.

180 Easy

180 of 331

Understanding +4 | -1

Choose the correct statement w.r.t. molecular weight of biomolecules.

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Correct option: D

Molecular weight of glycine and glucose is less than 800 Dalton

Option D (Molecular weight of glycine and glucose is less than 800 Dalton) is correct because both glycine (an amino acid) and glucose (a monosaccharide) have molecular weights significantly less than 800 Daltons.

Revision notes and key takeaways

Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

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Biomolecules practice · Mixed difficulty

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